Just because that's what they've decided to wear, doesn't mean the USAF or USAFR has officially adopted the tartan. I suppose they could turn around tomorrow and take a fancy to another unclaimed tartan and agree to dress the band in it with this line of thought. Whereas something fully official would be much more "concrete?" This is all speculation of course. I'm not claiming to have the definitive answer here. I'm just working with what I've seen, not trying to stretch it into something it's not. Who is this member you're waiting for a "definitive answer" from? Is this member in a position to give a definitive answer on behalf of the USAFR?